CN203149104U - Gradient coil - Google Patents
Gradient coil Download PDFInfo
- Publication number
- CN203149104U CN203149104U CN 201320107930 CN201320107930U CN203149104U CN 203149104 U CN203149104 U CN 203149104U CN 201320107930 CN201320107930 CN 201320107930 CN 201320107930 U CN201320107930 U CN 201320107930U CN 203149104 U CN203149104 U CN 203149104U
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- China
- Prior art keywords
- shimming
- gradient coil
- bar
- shim pack
- sheet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a gradient coil which comprises a main gradient coil, a shielding gradient coil, a first shimming strip and a second shimming strip. The first shimming strip and the second shimming strip are arranged between the main gradient coil and the shielding gradient coil. According to the gradient coil provided by the utility model, the first shimming strip and the second shimming strip are arranged between the main gradient coil and the shielding gradient coil, and thus the aperture of an imaging space is improved.
Description
[technical field]
The utility model is relevant a kind of gradient coil, refers in particular to a kind of gradient coil for magnetic resonance device.
[technical background]
The magnetic resonance device imaging need have an equally distributed main field.In the prior art, shimming is divided into initiatively two kinds of shimming (needing power supply) and passive shimmings (not needing power supply).Initiatively shimming is by giving the logical particular current of the good shim coil of coiling in advance (being determined by Distribution of Magnetic Field), and it is very simple to operate.Passive shimming is in the client erecting stage, the shimming material (such as the shimming sheet) that some ad-hoc locations in magnetic resonance device distribute and place.Because shimming sheet (such as 1.5T, 3T etc.) under the environment of highfield is stressed very big, for the sake of security, generally be after the field falls in magnet, to carry out passive shimming paster operation; Even the paster operation is carried out in the band field, because powerful magnetic field force, the shimming sheet quantity of pasting can not be too much.
During passive shimming, at first naked magnet system is carried out rising the field, measure its Distribution of Magnetic Field, the shimming sheet that calculates in the passive shimming process according to this Distribution of Magnetic Field distributes, and again the field is fallen in magnet, carry out paster according to the shimming sheet distribution of calculating, rise the field after having pasted again and survey the field, if magnetic field homogeneity meets the demands, then passive shimming finishes, the person does not repeat step before.This shimming process need does not stop falls field, paster, Sheng Chang, needs to consume a large amount of liquid heliums, needs a large amount of lifting field times simultaneously.
United States Patent (USP) is announced US5550472 number and has been disclosed a kind of gradient coil for magnetic resonance device, and it comprises main gradient coil, shielded gradient coil, the first shimming bar and the second shimming bar.The described first shimming bar is located between main gradient coil and the shielded gradient coil, the described second shimming bar is located at the inboard of main gradient coil, so arrange, can increase by the first shimming bar and the shared space of the second shimming bar, the aperture that reduces the imaging space of this magnetic resonance device.
Therefore, necessaryly provide a kind of improved gradient coil, to overcome the defective that above-mentioned gradient coil exists.
[utility model content]
The purpose of this utility model provides a kind of gradient coil that can increase the aperture of imaging space.
Gradient coil of the present utility model is to be achieved through the following technical solutions: a kind of gradient coil, it comprises main gradient coil, shielded gradient coil, the first shimming bar and the second shimming bar, and the described first shimming bar and the second shimming bar are located between main gradient coil and the shielded gradient coil.
In preferred embodiment, the described first shimming bar comprises base plate and is fixed at least one group of first shim pack on the base plate, first shim pack comprises some pre-shimming sheets, the described second shimming bar comprises the shimming box and is fixed at least one group of second shim pack in the shimming box that second shim pack comprises some on-the-spot shimming sheets.
In preferred embodiment, cylindrical imaging space of the inner formation of described gradient coil, imaging space is provided with central shaft, and the bottom surface of bottom on-the-spot shimming sheet is positioned on the face of cylinder that is constituted with described central shaft in the bottom surface of the bottom pre-shimming sheet in described first shim pack and second shim pack.
In preferred embodiment, the quantity of described base plate is the 10-30 bar, and every base plate is provided with 8-30 shim pack, and shim pack thickness is 1-8mm, and the shim pack on the same base plate is equidistantly to distribute.
In preferred embodiment, the described first shimming bar is the 10-30 group, and each group shimming bar is provided with 8-30 shimming box, and the shim pack on the shimming box equidistantly distributes.
In preferred embodiment, described base plate is provided with shimming sheet reference column, pilot hole and shimming sheet fixed bolt, being centered close on the same straight line of described shimming sheet reference column, pilot hole and shimming sheet fixed bolt.
In preferred embodiment, described pre-shimming sheet is provided with leakage glue hole and the pilot hole that from up to down connects, and the structure of pre-shimming sheet is all identical.
In preferred embodiment, described gradient coil is provided with the gradient coil front end face, and the described second shimming bar comprises that base portion reaches the end perpendicular with base portion, and described end is provided with for screw by the second shimming bar being fixed on the through hole of gradient coil front end face.
In preferred embodiment, the described first shimming bar and the second shimming bar are the isogonism annular spread.
In preferred embodiment, the described first shimming bar and the second shimming bar arrange at interval, and the angle between any adjacent two of the described first shimming bar and the second shimming bar all equates.
Compared with prior art, gradient coil of the present utility model has increased the aperture of imaging space by the first shimming bar and the second shimming bar are located between main gradient coil and the shielded gradient coil.
[description of drawings]
Fig. 1 is the sectional drawing of the utility model gradient coil.
Fig. 2 is the partial enlarged drawing at C place shown in Figure 1.
Fig. 3 be A-A shown in Figure 1 to cut-open view.
Fig. 4 is the partial enlarged drawing at D place shown in Figure 3.
Fig. 5 be B-B shown in Figure 1 to cut-open view.
Fig. 6 is the front view of the first shimming bar.
Fig. 7 is the vertical view of the first shimming bar.
Fig. 8 is the front view of base plate in the first shimming bar.
Fig. 9 is the front view of the second shimming bar.
Figure 10 is the vertical view of the second shimming bar.
[embodiment]
See also Fig. 1 to shown in Figure 5, the utility model is a kind of gradient coil 100 for magnetic resonance device, cylindrical imaging space 110 of gradient coil 100 inner formation, and this imaging space 110 is provided with central shaft 120.This gradient coil 100 comprise main gradient coil 20, shielded gradient coil 21 and be located at main gradient coil 20 and shielded gradient coil 21 between the first shimming bar 10 and the second shimming bar 11.The first shimming bar 10 and the second shimming bar 11 are located between main gradient coil 20 and the shielded gradient coil 21, can make nearer that distance between the first shimming bar 10 and the second shimming bar 11 leans on, effectively utilize the space between main gradient coil and the shielded gradient coil, needn't additionally increase the distance between main gradient coil 20 and the shielded gradient coil 21, increase the aperture of imaging space 110, and then increase patient's comfort level.Main gradient coil 20, shielded gradient coil 21 and the first shimming bar 10 use curing glue 22 to be fixed together, and can make between each parts more firm regularly.
See also Fig. 6 to shown in Figure 8, the first shimming bar 10 comprises base plate 101 and is fixed in some first shim pack 102 on the base plate 101.Base plate 101 is provided with shimming sheet reference column 1012 and the shimming sheet fixed bolt 1013 perpendicular with base plate 101, also is provided with being used for of paralleling with shimming sheet reference column 1012 on the base plate 101 base plate 101 is navigated to pilot hole 1011 on the main gradient coil 20.First shim pack 102 is made up of the pre-shimming sheet 1021 of same structure, and pre-shimming sheet 1021 is provided with leakage glue hole 10211 and the fixed orifice 10212 that from up to down connects, and the structure of every pre-shimming sheet 1021 is all identical.When encapsulating, leaking glue hole 10211 can be so that pre-shimming sheet 1021 be soaked fully by glue, and after adhesive curing, pre-shimming sheet 1021 is by more firm regularly.In the present embodiment, pre-shimming sheet 1021 uses silicon steel material to make, and in other embodiments, pre-shimming sheet 1021 also can use other strong magnetic material.Base plate 101 can be aluminum alloy materials, and perhaps highstrenghtpiston is such as epoxy resin.
See also Fig. 9 and shown in Figure 10, the second shimming bar 11 comprises shimming box 111 and is fixed in some second shim pack 112 on the shimming box 111.Shimming box 111 comprises that base portion 1111 reaches and base portion 1111 ends 1112 connected vertically, and end 1112 is provided with for screw by the second shimming bar 11 being fixed on the through hole 11121 of gradient coil 100 front end faces.Grasp this end 1112, the second shimming bar 11 can be extracted out from gradient coil 100 or inserted, increased the convenience of operation.Second shim pack 112 is made up of some on-the-spot shimming sheets 1121, and base portion 1111 comprises some shimming boxes 11111 of accommodating second shim pack 112.In the present embodiment, on-the-spot shimming sheet 1121 uses silicon steel material to make, and in other embodiments, on-the-spot shimming sheet 1121 also can use other strong magnetic material.
See also Fig. 1 to shown in Figure 10, in first shim pack 102 in the bottom surface of nethermost pre-shimming sheet 1021 and second shim pack 112 bottom 1121 bottom surface be positioned on the same face of cylinder centered by central shaft 120, so arrange, can increase the aperture of imaging space 110 to the full extent.
The first shimming bar 10 and the second shimming bar 11 arrange at interval, and the angle between any adjacent two of the first shimming bar 10 and the second shimming bar 11 all equates.
The second shimming bar 11 is the 10-30 group, and each group shimming bar is provided with 8-30 shimming box 11111, and second shim pack 112 on the shimming box 11111 equidistantly distributes.When installation, the installation slip-stick artist at first rises the field with magnet, measure Distribution of Magnetic Field, calculating shimming according to this Distribution of Magnetic Field again distributes, distribute according to this shimming more on-the-spot shimming sheet 1121 is packed in the shimming box 11111, in the gradient necklace 100 corresponding accepting holes (not shown) of again the second shimming bar 11 being packed into.In order to make the shimming maximizing efficiency, the second shimming bar 11 is the isogonism annular spread at gradient coil 100, and the second shimming bar 11 is with a kind of structure, and the shim pack 112 on the same second shimming bar 11 equidistantly distributes.The isogonism annular spread at this place refers to that the angle a1 between two adjacent first shimming bars 10 equates with a2, and wherein, this angle is the angle between adjacent two the second shimming bar, 11 centers.
The distribution of pre-shimming sheet 1021 is calculated by magnet data (can be the mean value of some magnet systems) earlier, carries out the configuration of number again.The distribution of on-the-spot shimming sheet 1121 then is when curstomer`s site is installed, and measures the Distribution of Magnetic Field of magnet, calculates on-the-spot shimming sheet according to this Distribution of Magnetic Field again and distributes.
The above only is a kind of embodiment of the present utility model, it or not whole or unique embodiment, the variation of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model instructions is claim of the present utility model and contains.
Claims (10)
1. gradient coil, it comprises main gradient coil, shielded gradient coil, the first shimming bar and the second shimming bar, it is characterized in that: the described first shimming bar and the second shimming bar are located between main gradient coil and the shielded gradient coil.
2. gradient coil as claimed in claim 1, it is characterized in that: the described first shimming bar comprises base plate and is fixed at least one group of first shim pack on the base plate, first shim pack comprises some pre-shimming sheets, the described second shimming bar comprises the shimming box and is fixed at least one group of second shim pack in the shimming box that second shim pack comprises some on-the-spot shimming sheets.
3. gradient coil as claimed in claim 2, it is characterized in that: cylindrical imaging space of the inner formation of described gradient coil, imaging space is provided with central shaft, and the bottom surface of bottom on-the-spot shimming sheet is positioned on the face of cylinder that is constituted with described central shaft in the bottom surface of the bottom pre-shimming sheet in described first shim pack and second shim pack.
4. gradient coil as claimed in claim 2, it is characterized in that: the quantity of described base plate is the 10-30 bar, and every base plate is provided with 8-30 shim pack, and shim pack thickness is 1-8mm, and the shim pack on the same base plate is equidistantly to distribute.
5. gradient coil as claimed in claim 2 is characterized in that: the described first shimming bar is the 10-30 group, and each group shimming bar is provided with 8-30 shimming box, and the shim pack on the shimming box equidistantly distributes.
6. gradient coil as claimed in claim 2, it is characterized in that: described base plate is provided with shimming sheet reference column, pilot hole and shimming sheet fixed bolt, being centered close on the same straight line of described shimming sheet reference column, pilot hole and shimming sheet fixed bolt.
7. gradient coil as claimed in claim 2 is characterized in that: described pre-shimming sheet is provided with leakage glue hole and the pilot hole that from up to down connects, and the structure of pre-shimming sheet is all identical.
8. gradient coil as claimed in claim 1, it is characterized in that: described gradient coil is provided with the gradient coil front end face, the described second shimming bar comprises that base portion reaches the end perpendicular with base portion, and described end is provided with for screw by the second shimming bar being fixed on the through hole of gradient coil front end face.
9. gradient coil as claimed in claim 1, it is characterized in that: the described first shimming bar and the second shimming bar are the isogonism annular spread.
10. gradient coil as claimed in claim 1, it is characterized in that: the described first shimming bar and the second shimming bar arrange at interval, and the angle between any adjacent two of the described first shimming bar and the second shimming bar all equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320107930 CN203149104U (en) | 2013-03-11 | 2013-03-11 | Gradient coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320107930 CN203149104U (en) | 2013-03-11 | 2013-03-11 | Gradient coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203149104U true CN203149104U (en) | 2013-08-21 |
Family
ID=48976620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320107930 Expired - Lifetime CN203149104U (en) | 2013-03-11 | 2013-03-11 | Gradient coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203149104U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112444766A (en) * | 2020-11-05 | 2021-03-05 | 上海联影医疗科技股份有限公司 | Magnetic resonance system and shimming method thereof |
| CN114942401A (en) * | 2022-07-25 | 2022-08-26 | 山东奥新医疗科技有限公司 | Passive shimming device and shimming method of magnetic resonance equipment |
-
2013
- 2013-03-11 CN CN 201320107930 patent/CN203149104U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112444766A (en) * | 2020-11-05 | 2021-03-05 | 上海联影医疗科技股份有限公司 | Magnetic resonance system and shimming method thereof |
| CN112444766B (en) * | 2020-11-05 | 2023-09-26 | 上海联影医疗科技股份有限公司 | Magnetic resonance system and shimming method thereof |
| CN114942401A (en) * | 2022-07-25 | 2022-08-26 | 山东奥新医疗科技有限公司 | Passive shimming device and shimming method of magnetic resonance equipment |
| CN114942401B (en) * | 2022-07-25 | 2022-10-25 | 山东奥新医疗科技有限公司 | Passive shimming device and shimming method of magnetic resonance equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130821 |
|
| CX01 | Expiry of patent term |